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diverticulum , pl. diverticula (dI-ver-tik´yu-lum, yu-la) [NA]
A pouch or sac opening from a tubular or saccular organ, such as the gut or bladder. [L. deverticulum (or di-), a by-road, fr. de-verto, to turn aside]
allantoenteric d. allantoic d
allantoic d. an endoderm-lined outpouching of the hindgut (in humans, the yolk sac of a very young embryo) representing the primordium of the allantois; in most amniotes, it grows into the extraembryonic celom; in humans, the distal part of the allantoic lumen is rudimentary, not extending beyond the body stalk.allantoenteric d;
diverticula of ampulla of ductus deferens the irregular sacculations of the ampullary part of the ductus deferens near its termination in the ejaculatory duct.diverticula ampullae ductus deferentis [NA];
diverticula ampul´lae duc´tus deferen´tis [NA] diverticula of ampulla of ductus deferens
cervical d. a d. in the neck derived from retention of part of one of the pharyngeal pouches (endodermal) or branchial grooves (ectodermal) of the embryo.
diverticula of colon diverticula, which are herniations of mucosa and submucosa through or between fibers of the major muscle layer (muscularis propria) of the colon. Usually multiple, it occurs in 50% of western populations above the age of 70, but is much less common in other populations. Can cause bleeding and episodes of severe inflammation.colonic diverticula;
colonic diverticula diverticula of colon
duodenal d. a d. of the duodenum, often of large size, that is occasionally found projecting from the duodenum near the duodenal papilla.
epiphrenic d. a d. which originates just above the cardioesophageal junction and usually protrudes to the right side of the lower meadiastinum.
false d. a d. of the intestine that passes through a defect in the muscular wall of the gut and thus does not include a layer of muscle in its wall.
Heister's d. See bulb of jugular vein.
hypopharyngeal d. pharyngoesophageal d
Kommerell's d. the d. at the origin of some aberrant right subclavian arteries resulting from incomplete arch agenesis.
laryngotracheal d. a d. from the floor of the caudal end of the pharynx which gives rise to the epithelium and glands of the larynx, trachea, bronchi, and lungs. Once this d. separates from the foregut, it is referred to as a tube.
Meckel's d. the remains of the yolk stalk of the embryo, which, when persisting abnormally as a blind sac or pouch in the adult, is located on the ileum a short distance above the cecum; it may be attached to the umbilicus and, if the lining includes gastric mucosa, peptic ulceration and bleeding may result.
metanephric d. an outgrowth from the caudal portion of the mesonephric duct on either side, which grows cephalodorsally to make contact with the masses of metanephrogenous tissue (nephric blastemas) that give rise to the epithelial lining of the ureter and of the pelvis and the collecting ducts of the kidney.
Nuck's d. processus vaginalis of peritoneum
pancreatic diverticula the ventral and dorsal endodermal buds from the embryonic foregut that constitute the primordia of the parenchyma of the pancreas.
Pertik's d. an abnormally deep recessus pharyngeus.
pharyngoesophageal d. most common d. of the esophagus; arises between the inferior pharyngeal constrictor and the crico-pharyngeus muscle.hypopharyngeal d., Zenker's d;
pituitary d. a tubular outgrowth of ectoderm from the stomodeum of the embryo; it grows dorsad toward the infundibular process of the diencephalon, around which it forms a cup-like mass, giving rise to the pars distalis and pars juxtaneuralis of the hypophysis.craniopharyngeal canal, hypophyseal pouch, Rathke's d., Rathke's pocket, Rathke's pouch;
pulsion d. a d. formed by pressure from within, frequently causing herniation of mucosa through the muscularis.
Rathke's d. pituitary d
thyroid d. , thyroglossal d. the endodermal bud from the floor of the embryonic pharynx; the primordium of the parenchyma of the thyroid gland.
tracheobronchial d. the endodermal lung primordium which will give rise to the epithelial lining of the respiratory tract.lung bud;
traction d. a d. formed by the pulling force of contracting bands of adhesion, occurring mainly in the distal esophagus, from tuberculous hilar or mediastinal lymphadenitis.
true d. a term denoting a d. that includes all the layers of the wall from which it protrudes.
urethral d. a sac-like outpouching of the urethral wall, either from a congenital defect or, more commonly, as a result of chronic penetrating inflammation.
ventricular d. a congenital outpouching of the right or left ventricle.
vesical d. a d. of the bladder wall; may be either true or false type.
Zenker's d. pharyngoesophageal d
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